Hello! Yes, you can use this suit for winter. Our fabric is made of polyviscose lycra, it is soft textured and breathable. It is not thin and provides all-day comfort. Thanks to the structure of the fabric, it is suitable for both summer and winter use. Additionally, thanks to the 60% Polyester, 35% Viscose, 5% Lycra content of our fabric, it is flexible and adaptable to the body. Its non-sweating structure provides comfort in long-term use. In winter, you can also wear additional clothing underneath, as our product is unisex and offers freedom of movement. Thank you for your interest! 😊